Riddle 1: What invention lets you look right through a wall? Answer: A window Riddle 2: What can you catch but not throw? Answer: A cold Riddle 3: What is at the end of a rainbow? Answer: ‘w’ Riddle 4: What is always coming but never arrives? Answer: Tomorrow Riddle 5: Which weighs more, a pound of feathers or a pound of bricks? Answer: Neither, they both weigh one pound Read more about Riddles 3 [With Answers][…]
Riddle 1: What invention lets you look right through a wall? Riddle 2: What can you catch but not throw? Riddle 3: What is at the end of a rainbow? Riddle 4: What is always coming but never arrives? Riddle 5: Which weighs more, a pound of feathers or a pound of bricks? Share Tweet View Email Print Follow
Centroid of Triangle: The coordinates of the centroid of the triangle with vertices A (x1, y1, z1) B (x2, y2, z2) and C (x3, y3, z3) Proof: Let D be the mid-point of AC then coordinates of D are Let G be the centroid of ΔABCThen, G divides AD in the ratio 2:1 So, coordinate Read more about Centroid of Triangle & Centroid of Tetrahedron[…]
Puzzle 1: Which number replaces the question mark?Answer: 45 Consider diagonally 15 + 15 = 30 35 + 5 = 40 30 + 15 = 45 40 + 5 = 45 60 + 15 = 75 50 + 5 = 55 Puzzle 2: Which number replaces the question mark? 3, 5, 13, 43, 177, ?, 5353 Answer: 891 3 Read more about Math Puzzle 4 [With Answers][…]
Method of naming organic compounds developed by IUPAC (International Union of Pure and Applied Chemistry). It’s called IUPAC system of nomenclature. Naming the organic compounds: Identify the parent chain Identify the functional group Accordingly add prefixes or suffixes. So IUPAC name of any organic compounds essentially consists of two or three parts. (i) Root Read more about Nomenclature of organic compounds[…]
a) Absolute error: Let a physical quantity A be measured n times and let A₁, A₂, … An be the results of these measurements. If Am is the arithmetic mean of these measurements, then Or … (1) Since the true value of the quantity is now known, we usually take Am to be the true Read more about Absolute Error, Mean Absolute Error, Relative Error (Or Percentage Error)[…]
Puzzle 1: Which number replaces the question mark?Puzzle 2: Which number replaces the question mark? 3, 5, 13, 43, 177, ?, 5353 Puzzle 3: Which number replaces the question mark?Puzzle 4: Which number replaces the question mark? If 2 + 3 = 8 3 + 7 = 27 4 + 5 = 32 5 + 8 = 60 6 Read more about Math Puzzle 4[…]
Puzzle – 1: ( ) + ( ) + ( ) + ( ) + ( ) = 30 This is what you have for equation. The following are the numbers that you can use to fill in the brackets: 1, 3, 5, 7, 9, 11, 13 and 15 You can repeat the numbers if Read more about Math Puzzles – 3 [With Answers][…]
Let v = a1 + λb1 and v = a2 + λb2 be the equations of two straight lines. If θ is the angle between them, then cos θ = , Also if θ is the angle between and , Then .Condition of perpendicularity: The lines are perpendicular, if b1 – b2 = 0 or Read more about Angle between Two Intersecting Lines[…]
Puzzle – 1: ( ) + ( ) + ( ) + ( ) + ( ) = 30 This is what you have for equation. The following are the numbers that you can use to fill in the brackets: 1, 3, 5, 7, 9, 11, 13 and 15 You can repeat the numbers if Read more about Math Puzzles – 3[…]